Python - 进入第一个 while 循环？

Question

好的，我有一个基于这里输入的 while 循环 -

username = str(input('whats your favorite word? (enter to quit)')).strip().lower()
while(len(username) > 0):
    counter = 0
    for c in username:
        if(c == 'a' or c == 'e' or c == 'i' or c == 'u' or c == 'o'):
            counter+=1
    ending = 'vowels' if counter > 1 else 'vowel'
    print(f"word has {counter} {ending}!")
    break

打印元音数量后，我需要突破并提示输入新用户名。 但中断导致程序退出，并继续无限重复最后一次打印。

我怎样才能回到第一个输入？

Answer 1

在循环中包含第一个输入：

username = str(input('whats your favorite word? (enter to quit)')).strip().lower()
while(len(username) > 0):
    counter = 0
    for c in username:
        if(c == 'a' or c == 'e' or c == 'i' or c == 'u' or c == 'o'):
            counter+=1
    ending = 'vowels' if counter > 1 else 'vowel'
    print(f"word has {counter} {ending}!")
    username = str(input('whats your favorite word? (enter to quit)')).strip().lower()

当你没有输入时程序将结束（直接按回车键）

Answer 2

如果您想重复获取用户名，那么该语句必须在循环中。 一种标准方法是在循环底部重复该代码。

username = str(input('whats your favorite word? (enter to quit)')).strip().lower()
while(len(username) > 0):
    counter = 0
    for c in username:
        if(c == 'a' or c == 'e' or c == 'i' or c == 'u' or c == 'o'):
            counter+=1
    ending = 'vowels' if counter > 1 else 'vowel'
    print(f"word has {counter} {ending}!")
    # Get another username
    username = str(input('whats your favorite word? (enter to quit)')).strip().lower()

Answer 3

您需要在循环内获得另一个用户输入：

username = str(input('whats your favorite word? (enter to quit)')).strip().lower()
while(len(username) > 0):
    counter = 0
    for c in username:
        if(c == 'a' or c == 'e' or c == 'i' or c == 'u' or c == 'o'):
            counter+=1
    ending = 'vowels' if counter > 1 else 'vowel'
    print(f"word has {counter} {ending}!")
    username = str(input('whats your favorite word? (enter to quit)')).strip().lower() # Here!

Answer 4

我会使用if和break内循环：

while True:
    username = str(input('whats your favorite word? (enter to quit)')).strip().lower()
    if not username:  # check if username is an empty string
        break
    # calculations and print are here